<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script> 
    <div id="app">
        <span v-bind:title="message">
            kk
        </span>
        <br>
        <!-- <button v-on:click="message">click me</button> -->
        <h1 v-if="ok">yes</h1>
        <h1 v-else>no</h1>
        <h1 v-if="type==='A'">A</h1>
        <h1 v-else-if="type==='B'">B</h1>
        <h1 v-else-if="type==='C'">C</h1>
        <h1 v-else>D</h1>
        <br>
        {{ message }}
    </div>
    <script>
        var vm = new Vue({
            el: "#app",
            data: {
                message: "hi, vue",
                ok: 1,
                type: "A",
            },
            methods: {}
        })
    </script>
</body>
</html>